Pioneer PL 630 - Got everything working except auto-stop function

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Gstein43
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Pioneer PL 630 - Got everything working except auto-stop function

Post by Gstein43 » 24 Jul 2019 02:31

I recently acquired a beautiful PL 630 which had several problems that required fixing:

- Speed was erratic and spun at times so fast thought the platter was going to spin off! Used DeOxit on speed control and other buttons which resolved the issue. SOLVED.

- Rubber sleeve that housed the foot springs were trashed. Removed and applied a coat of RVT silicone and they are now good as new. SOLVED.

- Grease was old and it parts almost hard. Cleaned and re-greased. SOLVED.

Now onto the final piece of the puzzle...

- Manual works great. Auto start works great. But...when I press auto stop the tonearm lift raises the tone arm off of the record and attempts to move towards the tone are rest (more like jerks/lurches about 1/4 inch) then stops and the tone arm lowers back down on the record.

I'm soooooo close. Anyone experience this issue before or have any words of wisdom?

P4t1n3tt3
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Re: Pioneer PL 630 - Got everything working except auto-stop function

Post by P4t1n3tt3 » 24 Jul 2019 19:38

Welcome among us.

I have a PL-630 that I do not use because it has a problem with speed and suspension. On the other hand, the automation works perfectly.

From memory, automation is not mechanical but optical with "mirrors". That may be where the problem lies ...

Here is a link that I put aside for a future restoration:
https://www.audiokarma.org/forums/index ... ble.92333/

Hoping to have been able to help.

Gstein43
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Re: Pioneer PL 630 - Got everything working except auto-stop function

Post by Gstein43 » 06 Aug 2019 22:17

I have the SM and have read Section 7.1 Control Section which discusses the pickup plate and the lamp/LED. Not exactly sure what my next step should be.

Any recommendations on what to try next?

P4t1n3tt3
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Re: Pioneer PL 630 - Got everything working except auto-stop function

Post by P4t1n3tt3 » 07 Aug 2019 17:35

I just watched the service manual. Under the armbase, we see several parts that could allow the movement of the tonearm. I will look if there is no dried grease that would block the return of the tonearm. :wink:

Gstein43
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Re: Pioneer PL 630 - Got everything working except auto-stop function

Post by Gstein43 » 07 Aug 2019 21:16

I may have found the issue. See attached picture. May be hard to see in picture but the plastic part with the screw under Stopper PNW-469 appears to be cracked and there is extremely hard tellow grease on the shaft directly above (towards the tonearm) the plastic part.
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Gstein43
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Re: Pioneer PL 630 - Got everything working except auto-stop function

Post by Gstein43 » 07 Aug 2019 21:47

Confirmed after disassembling plate with screw off, crack on one side ‘stress crack’ on the other. Read other threads were thin metal shaft was used (as epoxy glue does not seem to fix it). Anyone here ever used the metal shim cut to fit over plastic part and held in place with a set screw? If so, any advice to provide?
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P4t1n3tt3
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Re: Pioneer PL 630 - Got everything working except auto-stop function

Post by P4t1n3tt3 » 08 Aug 2019 05:54

All the information you are looking for is on the link I left above. :wink: He talks about this problem herehttp://audiokarma.org/forums/index.php? ... ost-928172.

One solution is to create a metal belt as described here http://audiokarma.org/forums/index.php? ... st-8147984 .

More info here http://audiokarma.org/forums/index.php? ... st-9256992 .

A photo of the metal belt here http://audiokarma.org/forums/index.php? ... st-9717690 (You must be registered to view the pics)

Hoping to have been of assistance.

hertzdonut
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Re: Pioneer PL 630 - Got everything working except auto-stop function

Post by hertzdonut » 11 Aug 2019 11:32

I had the same stress crack on mine. I cut a slice of shim stock, bent and wrapped it around, and drilled it. I had a small, self-tapping screw and voila, fixed. (and that was three years ago!)

Hope this helps!

- Jeff

https://i195.photobucket.com/albums/z17 ... g~original

https://i195.photobucket.com/albums/z17 ... g~original

https://i195.photobucket.com/albums/z17 ... g~original

Gstein43
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Re: Pioneer PL 630 - Got everything working except auto-stop function

Post by Gstein43 » 25 Aug 2019 19:53

So I created a thin metal wrapper belt and installed it.

However, after installing, the TT is now worse than it was. Before the install, "stop" was the only non-functional part of the player. Now after installing the metal belt, when I start the TT, the headshell drops halfway between the resting position and the normal starting position of the record. And, the stop function still not working.

One question I have is can I reuse the same screw when installing the metal belt. Or, since the belt now creates a slightly larger circumference, do I need to find a slightly longer screw?

I'm motivated to get this TT working properly, but for right now its 1 to 0...and the turntable is winning!

Gstein43
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Re: Pioneer PL 630 - Got everything working except auto-stop function

Post by Gstein43 » 25 Aug 2019 23:45

Getting closer. Removed stylus adjustment drop cap and turned screw about 90 degrees clockwise. Tonearm now drops down on the proper position of the record.

Also cleaned the drive edge with isopropyl alcohol and this seemed to slightly improve the performance of the stop function.

When I press stop, the tonearm now raises off the record and travels about 1/3 of the way to the tonearm rest, lowers and then does not move any further. If I hit stop again, the tonearm will raise move another 1/4 inch and then lower. One last time hitting stop moves the tonearm another 1/4 inch or so. After all of that, tonearm is still 1-1.5 inches away from tonearm rest and won't move any further by hitting stop button.

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